Triangles of the neck

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Across
  1. 4. venous vessel found within the carotid sheath
  2. 6. a loop of nerve formed by nerve roots C1-3
  3. 9. the triangle bounded anteriorly and posteriorly by the digastric muscle
  4. 10. rib 1 has a groove for which artery
  5. 14. nerve with roots C3, 4, 5
  6. 15. a space bounded anteriorly by buccopharyngeal fascia and posteriorly by alar fascia
  7. 16. cranial nerve found within the carotid sheath
  8. 17. the brachial plexus arises between the anterior and middle muscle belly of
  9. 18. infrahyoid muscle containing two muscle bellies
Down
  1. 1. vein which terminates by draining into the subclavian vein
  2. 2. muscle which depresses the hyoid bone and elevates the larynx
  3. 3. geniohyoid muscle can be categorised into this muscle group
  4. 5. nerve derived from the posterior cord of the brachial plexus
  5. 7. muscle arising between the temporal bone, sternum and clavicle
  6. 8. the terminal branch of the medial cord of the brachial plexus
  7. 10. the triangle containing lymph nodes which drain the floor of the mouth and parts of the tongue
  8. 11. the triangle bounded medially by sternocleidomastoid and posteriorly by the digastric muscle
  9. 12. the triangle containing the thyroid, parathyroid glands and infrahoyids
  10. 13. nerve innervating trapezius muscle